Using NGINX Reverse Proxy (Authentication and HTTPS)

Hi, I’ve followed this thread carefully but can’t find an answer to my problem.

All I want to do is use NGINX as a reverse proxy without SSL or other authentication, with local LAN clients only. I want NGINX to filter requests by IP address and deny access to certain OH sitemaps, depending on the IP address. (This is to work around the problem where a tablet user can access any sitemap simply by selecting it in the pop-over try that appears when clicking the icon.)

Details, including relevant nginx conf file code snippets are here. (If you all prefer I consolidate & move my entire query over here I will condense it and do so.)